Rocket projectile



Dec. 6, 1949 v s, GOLDEN 2,490,349

ROCKET PROJECTILE Filed Sept. 14, 1944 Fig-l- II] I! 2 "I W v) 7 lllll i; g

arwa/wbw \EIIDNEY EEILDEN,

MWWMMM W UNITED STATES ENT OFFICE ROCKET PROJECTILE Sidney Golden, Cumberland, Md, assignor to the United States of America as represented by The Secretary of War Application September 14, 1944, Serial No; 554,058

9 Claims. (Cl. 102-49) 1 52.

This invention relates to an improvement in on the fins will rotate the rocket in flight. The rocket propelled projectiles, more particularly to stabilizing fins, by being so disposed at the rear a combination trap and nozzle for such projecof the rocket motor chamber, result also in a retiles. duction in the overall diameter of the rocket and Many types of rockets have utilized a'venturi :3 projectile and especially permit the projector nozzle which is integrally formed by a swaging tube, from which the rocket is adapted to be operation on the rear end of the rocket motor. fired, to be reduced in diameter.

The development of such a nozzle by swaging The invention to be described in more detail generally fails to produce an accurately concenlater essentially comprises securing a trap memtric inner surface, consequently considerable maher onto the end of a tube or rod mounted in the chining of the inner surface of the nozzle is remotor chamber and upon which is supported the quirccl. Obviously this construction and method propulsion charge. The trap member serves not of fabrication involves increased manufacturing only to trap the propellant charge on the rod costs. but also cooperates with the walls of the motor Accordingly, it is an object of this invention to chamber to define a nozzle which willhave highprovide an improved design of rocket projectile ly concentric discharge properties.

which will expedite the manufacture thereof. There is shown in assembled relation in Fig. 1

A particular object of this invention is to proa rocket projectile embodying this invention. A vide a rocket projectile wherein a single member rocket motor housing I comprising a. hollow cydefines the nozzle thereof and functions as a trap lindrical tube is provided to house the propellent for the propellent charge. charge of the rocket projectile. A rod 2 is axially The specific nature of this invention as well as mounted within rocket housing I and is'suitably other objects and advantages thereof will clearly secured to the forward wall (not shown) of the appear from a description of a preferred embodihousing. The housing 1 is of course secured to ment as shown in the accompanying drawing in a suitable head containing the pay load in conwhich: ventional manner. A propellent charge 3 prefer- Fig. 1 is an enlarged longitudinal sectional deably comprising a plurality of laminated disks tail view showing the combination propellant of suitable combustible material to generate protrap and nozzle. pellentfiuid, is strung on the rod 2. An annular Fig. 2 is a cross-sectional view taken along the so trap member '6 having an exterio periphery P e plane 22 of Fig. l. erably of frusto-conical shape, is screwed onto Fig. 3 is a cross-sectional view taken along the an intermediate threaded P i 211 of rod plane 3 -3 i-Fig, 1, However trap member 4 could be formed inte- In the design of highvelocity rocket Iprojeegrimy h 0 2 if e The Shape Of p tiles it is very important that the integrated 3.3 member 4 is such 945150 define an annular thrust produced by the high velocity discharge of Charge nozzle opening in coope With e the propellent fluid does not have aresultant Wall of housing I Preferably the peripheral which is 01f to one side of the axis of symmetry surface of trap member 4 comprises a surface of of the rocket as the center of thrust will then r v lu i n. The trap-member 4 is Iar Y th n be out of line with the center of mass and the is) e ho e in charge .3 and thus acts as a trap r flight of the rocket will be characterized by large $11011 Chargedispersions. In this invention a jet forming If it is desired to produce .amorerigid support member is provided which has a periphery comof the rear unsupported end of rod 2 to insure prising a surface of revolution that may be easily s alignment Ce y and co-aXially Within and accurately machined so that when the memrocket motor housing I a spider 5 may be prober is positioned centrally and concentrically vided which slips over rod 2. Arms 6 of spider within the cylindrical shell forming the motor 5 bear against the inner wall of rocket motor chamber, an annular jet having symmetrically housing l as shown in Figs. 1 and 2 and provide flared sides may be easily attained. necessary support for maintaining trap rod 2 This invention is further characterized by the co-axially within rocket motor housing i. To fact that the fins necessary for stabilizing the prevent the entrance of moisture into rocket rocket in flight may be secured to the combusmotor housing I, a sealing disk I may be placed tion chamber at the rear of the nozzle and may across the rear end of such housing and is sealed be set askew relative to the axis of the rocket so therein by a suitable cementing material such as that the reaction produced by the propellent fluid rubber cement. On the extreme rear end of trap rod 2, a plurality of stabilizing fins 8 are secured to such trap rod as by welding. Stabilizing fins 8 will have very great stabilizing effect on the rocket projectile, and as is known in the art, such fins may be slightly skewed to produce a rotational force on the rocket projectile.

Upon ignition of propulsion charge 3 by any conventional igniter (not shown), the gas pressure built up within housing I readily blows out sealing disk 1. The propulsion gases flow smoothly thru the nozzle produced by trap member 4 thereby providing free, uninterrupted flow of such gases out the rear end of the housing I. Trap member 4 secures the propulsion charge 3 on trap rod 2 until such charge is substantially consumed.

From the foregoing description it is readily apparent to those skilled in the art that a nozzle and trap combination, as illustrated in the appended drawing, is simple and cheap to manufacture. Further, such trap member serves to securely trap the propulsion charge until the burning is substantially completed and also provides uninterrupted flow of the propulsion gases out of the rocket motor. It is desired to point out however that such combination trap and nozzle member is not limited to use with a laminated charge as illustrated but is equally effective with a charge comprising a single stick of propulsion material having an axial passage for mounting on rod 2.

I claim:

1. In a rocket projectile, a hollow cylindrical motor housing of uniform thickness and radius throughout, open rearwardly with respect to the rocket projectile, a rodlike member mounted axially within the hollow portion of said housing, and a radially enlarged portion on said rodlike member, the peripheral surface of said enlarged portion being shaped to define an annular Venturi discharge nozzle opening between said enlarged portion and the interior wall of said housing, the cross-section area of said nozzle being a minimum near its forward end and a maximum near its rear end.

2. The combination defined in claim 1 wherein said peripheral surface of said enlarged portion comprises a surface of revolution.

3. In a rocket projectile, a hollow cylindrical motor housing open rearwardly with respect to the rocket projectile, a propellant charge mounted within said motor housing, a support rod mounted axially within the hollow portion of said housing and an annular member threadably secured to said support rod, the periphery of said annular member being shaped to define an annular discharge nozzle opening between said member and the interior wall of said housing.

4. The combination defined in claim 3 wherein said propellant charge has an axial hole therethru, said charge being mounted on said support rod forwar ly o s id annu ar memb 4 whereby said annular member functions as a trap for said propellant charge.

5. The combination defined in claim 3 wherein said peripheral surface of said annular member comprises asurface of revolution.

6. In a rocket projectile, a hollow cylindrical motor housing open rearwardly with respect to the rocket projectile, a propellant charge mounted within said motor housing, a support rod mounted axially within the hollow portion of said housing and having a portion extending rearwardly out of said motor housing, a radially enlarged portion on said rodlike member lying within said motor housing, the peripheral surface of said enlarged portion being shaped to define an annular discharge nozzle opening between said enlarged portion and the interior wall of said housing, and a plurality of fins secured to the said rearwardly extending portion of said support rod, whereby said fins are disposed in the discharge path of the gases generated by said propellant charge.

7. The combination defined in claim 6 wherein said propellant charge has an axial hole therethru, said charge being mounted on said rodlike member forwardly of said radially enlarged portion whereby said enlarged portion functions as a trap for said propellant charge. 8. In a rocket projectile, a hollow cylindrical motor housing open rearwardly with respect to the rocket projectile, a propellant charge mounted within said motor housing, a support rod mounted axially within the hollow portion of said housing and having a portion extending rearwardly out of said motor housing, and an annular member threadably securedto a portion of said support rod lying within said housing, the exterior of said annular member being shaped to define an annular discharge nozzle opening between said member and the interior wall of said housing.

9. The combination defined in claim 8 wherein said propellant charge has an axial hole therethru, said charge being mounted on said support rod forwardly of said annular member whereby said annular member functions as a trap for said propellant charge.

SHDNEY GOLDEN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 35,977 Roys et al July 22, 1862 483,126 Bates Sept. 27, 1892 579,035 Bell Mar. 16, 1897 FOREIGN PATENTS Number Country Date 841,015 France Jan. 28, 1939 

